OD/OF Series Little Demon Carbon Composition Molded 10% Tolerance FeatureS Ohmites Little Demons are small, reliable carbon composition resistors with exceptional strength. Molded insulation for high dielectric strength They are made tough by a molding process that Rugged construction combines the terminals, insulation and resistive ele- High surge capabilities ment into an integrated unit. Along with their small size, Little Demons perform with low noise, dissipate Comparable to Mil RC07, RC20, and RC32 types heat rapidly and offer high temperature stability. OD/OF Series available in E12 values Color codes are readable even after prolonged use 5% Tolernace Discontinued August 2021 thanks to a very durable coating that resists abra- sions and chipping normally associated with auto- matic insertion equipment. SerieS SpeciFicatiOnS Series Mil-R-11 Type Wattage Ohms Tolerance Max. Voltage Dielectric VAC OD RC07 0.25 2.2 - 5.6M 10% 250 500 OF RC20 0.50 2.2 - 18M 10% 350 700 characteriSticS 100,000 Terminals Solder-coated copper terminal. Single Pulse Power Capability Body Molded Phenolic 10,000 10% Tolerance OF 1,000 OD Derating Linearly from 100% +70C to 0% 130C 100 10 1 -7 -6 -5 -4 -3 -2 -1 10 10 10 10 10 10 10 1 Pulse width (s) DimenSiOnS Series Length max. Diam. max. Lead Dia. 1.135 0.12 D L OD 0.276 / 7.0 0.098 / 2.5 0.024/0.60 28.83mm 3 OF 0.406 /10.3 0.150 / 3.8 0.028/0.70 (continued) 92 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info ohmite.com Pulse Power (W)75mm 5 OD/OF Series Little Demon Carbon Composition Molded 10% Tolerance packaging All resistors are packaged in sealed poly bags with desiccant Storage: Ohmite recommends storing carbon composition to maintain a consistent humidity during storage. If parts are resistors in a controlled environment at a temperature of 5 to removed from the protective plastic bag they should be used 35C and relative humidity of less than 60%. Inventor y should as soon as possible or resealed in the plastic bag. always be used on a first-in-first-out basis. Tape/Reel OD OF 0.5mm max. 6mm .5 Qty./reel 5000 3000 +1.6 52.4mm Reel size (mm) 260 260 -1.4 Qty./carton 40,000 24,000 260mm Gross carton wt. (kg) 12 13 5 3 Carton size (m ) 0.04 0.04 5.08mm .38 455mm 5 Ammo Box OD OF 1mm max. Tape width (mm) 52 52 Qty./box 2000 2000 60mm 5 (OD) 14.5mm .5 Qty./carton 30,000 30,000 65mm 5 (OF) Gross carton wt. (kg) 10 16 Carton size (m3) 0.03 0.05 3.2mm min. L L 3mm 1 2 75mm 5 L L = 1mm max. 1 2 60.4mm1 60.4mm 1 reSiStOr uSe guiDelineS Carbon composition resistors are manufactured by extruding moisture and, therefore, storage recommendations should be a blend of carbon and organic binders inside a phenolic outer adhered to. Generally, any moisture absorbed during storage body. The extrusion is cut to length, leads inserted, cured, will bebaked ou during the soldering operation. If the prod- and marked to form a finished resistor. The carbon and binder uct is stored properly the resistance shift during the soldering mixture is adjusted to produce different resistance values. The operation will be minimal, less than 2% or 3%. resistors are sorted for 10% and 20% tolerance values. Carbon composition resistors are highly hygroscopic and Carbon composition resistors are able to withstand larger changes in resistance value can occur if too much moisture is short-term pulses and higher voltages than film resistors and absorbed. For this reason, it is recommended not to use water are virtually imper vious to ESD events (Electro-static dis- or water-soluble solvents to clean these components. Alcohol charge). Carbon composition resistors are also sensitive to or hydrocarbon solvents are recommended for rinsing. bake prOceDure anD cautiOnS A. Heat Treatment C. Solder heat test after treatment D. Cautions 110C 10C Solder Dip Solderability: may be affected due to oxidization of lead wire 15 hours Type Temp. Time Evaluation Resistance value: some units may not completely recover to B. Frequency of OD 300C 3 sec within 3% original value. heat treatment OF 350C 3 sec within 3% Soldering heat: some treated product may have substantial 1 time only resistance change during soldering operation. It is recom- *Depth of Immersion: 4mm from the resistor mended that parts be tested to evaluate soldering heat body effects. Solder should not come in contact within 4mm of resistor body as this may cause a significant shift in resis- tance value due to high heat exposure. OrDering inFOrmatiOn RoHS compliant OD683KE -TR Series Ohms Tolerance Packaging OD None = cut reel, 100/bag (std.) 68G= 6.8 K = 10% -TR = taped and reeled OF 680 = 68 -A = ammo pack 681 = 680 -B = bulk (loose) 682 = 6,800 683 = 68,000 684 = 680,000 rev 8/21-4 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info ohmite.com 93 280mm (ref.)